Service 'beat' failed to build : The command '/bin/sh -c pip install --no-cache-dir -r requirements.txt' returned a non-zero code: 1 about cabot HOT 3 OPEN

Step 10/16 : RUN pip install --no-cache-dir -r requirements.txt
 ---> Running in cb3bf9635c9b
Traceback (most recent call last):
  File "/usr/bin/pip", line 9, in <module>
    load_entry_point('pip==21.0.1', 'console_scripts', 'pip')()
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 542, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2569, in load_entry_point
    return ep.load()
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2229, in load
    return self.resolve()
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2235, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/usr/lib/python2.7/site-packages/pip/_internal/cli/main.py", line 60
    sys.stderr.write(f"ERROR: {exc}")
                                   ^
SyntaxError: invalid syntax